scholarly journals Effects of Climate, Limnological Features and Watershed Clearcut Logging on Long-Term Variation in Zooplankton Communities of Boreal Shield Lakes

Water ◽  
2017 ◽  
Vol 9 (10) ◽  
pp. 733 ◽  
Author(s):  
David Lévesque ◽  
Bernadette Pinel-Alloul ◽  
Ginette Méthot ◽  
Robert Steedman
Keyword(s):  
Term Variation ◽  
Boreal Shield ◽  
Clearcut Logging ◽  
Zooplankton Communities ◽  
Shield Lakes

Relationships between dissolved organic carbon concentrations, weather, and acidification in small Boreal Shield lakes

2008 ◽  
Vol 65 (5) ◽  
pp. 786-795 ◽  
Author(s):  
W. (Bill) Keller ◽  
Andrew M Paterson ◽  
Keith M Somers ◽  
Peter J Dillon ◽  
Jocelyne Heneberry ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Temporal Variation ◽  
Multiple Regression ◽  
Regression Models ◽  
Short Term ◽  
Multiple Regression Models ◽  
Boreal Shield ◽  
Shield Lakes

We used multiple linear regression analyses to explore empirical relationships between dissolved organic carbon (DOC) concentrations, weather, and acidification in long-term data sets from 12 small Boreal Shield lakes in Ontario, Canada. In two lakes in which pH changes have been very large (4.5 to ~6.0), pH explained most of the temporal variation in DOC concentrations. In the remaining lakes, long-term average previous temperature (on the scale of a decade or more) was usually the best explanatory variable for DOC concentrations. Lake-specific multiple regression models constructed from long-term and short-term attributes of weather (long-term average previous temperature and precipitation, winter–spring precipitation, summer precipitation, summer sunshine) and pH explained between 41% and 96% of the temporal variation in DOC concentrations during the entire monitoring period for these lakes (n = 16–26 years). Multiple regression models considering only the period common to all lakes, 1987 to 2003 (n = 16–17 years), explained 35%–96% of the variation in DOC concentrations. The importance of long-term and short-term attributes of weather in explaining temporal variations in DOC concentrations suggests that changes in climate will have large effects on lake clarity; however, the interactions between weather-related effects may be very complex.

Comparative impacts of fire and forest harvesting on water quality in Boreal Shield lakes

2000 ◽  
Vol 57 (S2) ◽  
pp. 105-117 ◽  
Author(s):  
Richard Carignan ◽  
Pierre D'Arcy ◽  
Sébastien Lamontagne
Keyword(s):  
Water Quality ◽  
Organic Nitrogen ◽  
Light Attenuation ◽  
Forest Harvesting ◽  
Total Organic Nitrogen ◽  
Simultaneous Impact ◽  
Boreal Shield ◽  
Clearcut Logging ◽  
Mobile Ions ◽  
Shield Lakes

Water quality was monitored in Boreal Shield lakes for 3 years following their simultaneous impact by clearcut logging or wildfire. Seventeen similar undisturbed lakes served as references. Dissolved organic carbon (DOC) and the light attenuation coefficient (εPAR) were up to threefold higher in cut lakes than in reference and burnt lakes. Compared with median values for reference lakes, cut and burnt lakes had higher concentrations of total phosphorus (TP) (two- to three-fold), total organic nitrogen (TON) (twofold), and K+, Cl-, and Ca2+ (up to sixfold). NO3- and SO42- concentrations were up to 60- and 6-fold higher, respectively, in burnt lakes than in reference and cut lakes. In most cases, impacts were directly proportional to the area harvested or burnt divided by the lake's volume or area. These simple models correctly predicted the changes observed in three lakes harvested during the study. Some of the ob served effects occur on different time scales. Mobile ions released by fire (K+, Cl-, SO42-, NO3-) or harvesting (K+, Cl-, some DOC) are rapidly flushed out of the watershed (50% decrease in 3 years). Other constituents or properties (TP, TON, DOC, εPAR, Ca2+, Mg2+) show little change or are still increasing after 3 years and will take a longer time to reach normal levels.

Chemical and Biological Changes in Nelson Lake, Ontario Following Experimental Elevation of Lake pH

1977 ◽  
Vol 12 (1) ◽  
pp. 213-232 ◽  
Author(s):  
N.D. Yan ◽  
W.A. Scheider ◽  
P.J. Dillon
Keyword(s):  
Heavy Metal ◽  
Lake Ontario ◽  
Background Concentrations ◽  
Precambrian Shield ◽  
Metal Levels ◽  
Zooplankton Communities ◽  
Shield Lakes

Abstract Intensive studies of Nelson Lake, a Sudbury area lake of intermediate pH ~5.7), were begun in 1975. The chemistry of the lake was typical of that of most PreCambrian Shield lakes except that low alkalinities and high sulphate concentrations were observed along with elevated heavy metal levels. After raising the pH of Nelson Lake to 6.4 by addition of Ca(OH)2 and CaCO3, the metals were reduced to background concentrations. Phytoplankton and Zooplankton communities, which at pH of 5.7 were typical of PreCambrian lakes, were not affected by the experimental elevation of lake pH.

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